Pressure gauge with deflator



Patented `June 29, 1926.

uNITsu:sf'ia'rrfzsA PATENT ossi-CE. f

GUSTAVE A. minimun, Jn., oF sAN ANroNIo, TEXAS, Assieivon- 'ro A.` seHnAnnn'fs soN, INC., or NEW YORK, N. A CORPORATION on NEWYORK.

PRESSURE GAUGE WITH DEFLATOR.

Application filed December 30, 1924. Serial No. 758,887.

The present invention relates to pressure gauges for pneumatic tires and aims tol pro'- vide certain improvements therein. f

Riding comfort in an automobile and the life of the tires thereon depend to a great degree upon the tires being properly inflated,

which means that tires of given sizes should be inflated to predetermined pressures. To

insure the best results, it is customary for the io operator to test the pressures within his tires with any conventional form of pressurev gauge. To obtain proper inflation-of the tire, the common practice is to first inflate the tire by applying to the tire valve any 1nliatinc cou lin(Y which is connected with a D l y n a a ,source of compressed air, until it is thought sufficient air has been introduced' into the tire7 `whereupon the coupling is'- removedv from the tire valve and a pressure gauge applied thereto in order to ascertain the pressure within the tire. The type of gauge almost universally used forthis purpose is the stay-up variety in which the pressure indicator is maintained in indicating position after the gauge is removed from the tire valve. Ii", upon gauging the tire the pressure therein is found to be too low, addi! tional air is introduced into the tire and the gauging operation repeated after the indieating member of the gauge has been reset to zero. These operations are repeated until the gauge indicates proper inflation or over-inflation. If overinated, some of the air must be vented from the tire, and this 's usually accomplished by holding the tire valve unseated with a match stick or the sci-ev.' driver projection on the valve cap or any other means conveniently at hand until it thought that sufficient air has been vented, whereupon the pressure is`V again tested. These operations are repeated until the desired pressure Within the tire is obtained. Obviously, the repeated resettingof l the indicating member of the gauge to its zero position and the deflating operations by a. separate deflatiiig means are time consuming., and where a deflating means is not con-- movable indicating member of the pressure gauge as to provide for'tlie resetting of the indicatingmember toits Zero position when the deiiator is pressed yinto engagement with tlievalve pin to unseatthe valve. In carrying outmy invention, the deflator is preferably formed as a central projection which extends outwardly from the top of the mov-v able indicator of the gauge, at which location it is always'conveniently at hand and ready for immediate use. lThe invention al'-y so yincludes other features of novelty which will be hereinafter more fully described.

the accompanying drawings I have shown several embodiments oflmy invention,

whereini Y 'Figure 1 is a perspective view of a tire pressure gauge embodyin'gmy invention.

Fig. 2 is a longitudinal section partly inv elevation of' the pressure gauge and deflator 75 applied in deiating position to a pneumatic n tire valve. p i

Fig. 3 is an elevation, partly in section, of a modification, the gauge being shown in'an inverted position.

Fig. 4 is a top plan view of the gauge shown in Fig. 3. Fig. 5 shows a further modification of the invention. v A

Referring first to Figs. l and 2 of the drawings, let A indicate the pressure gauge and deflator as a whole, which comprises a cylindrical casing B having mounted at the foot end thereof apress-on seat- C and a tire valve depressor E. Mounted within the casing B is an elastic thimble F surrounded by` a loading springG, one end of which is fixed to an anchor nut H adjacent the foot portion of the casing, and the other end of which is connected to a plunger I adapted to move outwardly upon distension of the thimble F when air under pressure is admitted thereto. In its outward movement the plunger I carvries with it a pressure indicating member or sleeve K, which telescopes with the casing B 190 and is adapt-ed to b e held in pressure indicating position by a split spring ring lc after the plunger I is retracted bythe spring G. The indicating member K may be returned to its zero position by applying a slight force, directed inwardly, against the top of said member. The pressure gauge as thus far described is the conventional Schrader universal tire gauge.

According to the present invention, in or- H0 der to facilitate the deflating or venting of air from a tire, the top of the pressure indi eating member K is formed with a central outwardly extending projection of a diameter to freely pass Within the opening at the outer end of'a tire valve stem. Asshownin Fig. 2, the projection. is indicated by the letter L, and said projection is shown in the position holding the valve of the valve insides M mounted within the tire valve N unseated. The deflator L, it Vwill be understood, may be ither integrally formed with the pressure indicating member, asshown in Figs. l and 2, wherein it is pressed out of the top of the sheet metal shell which constitutes the indicating member during the process of forming the shell, or it may be formed as a separate element or pin L and secured to the top of the indicating member, as shown VatiL2 in Fig. 3. To insure against slipping of the deiiator pin when applied to avalve, jthe top of the pin may be provided with a centerdepression, ,as shown at Z in Fig. 3. Obviously i a similar depression may be provided in the hollow pin L, tered Z, Y t

In addition to having the deflator and pressure gauge, incorporated in a single structure and thusy insuring the presence of a deliator when gauging a tire, the specific location .and arrangement of the deiiator with respect to the Oauge, serves the addin tional function of resetting the pressure indicating member to its Zero position when as shown in VFig.V 5 and letn the detlator is pressed into engagement with I thevalve pin, thus rendering the gauge ready for a future gauging operation. yThe device as herein disclosed,`it will be appreciated, is very simple, compact and may be used for either gauging or defiating a tire, asV desired, by merely turning the gauge within the hand. Y

While I have shown and described certain preferred embodiments of my invention, it will Vbe understood that other modifications thereof may be resorted to without departing from the spirit of the invention.

' WhatI claim is: n Y

l. A pressure gauge for pneumatic tires or the iile comprising a cylindricalV casing and a cylindrical sheet metal indicating `member teiescoping with the casing 'having an integral hollow central projection extend ingv outwardly from the top of the indicating member, said projection being of a diameter to. enter the open end of a tire valve and larger than the diameter of the valve pin within-such tire valve".V l

2. A. pressure gauge VVcomprising' Van elon' gated casing, an indicating member telescopring with the casing and a projection extending outwardly from the top of the indicating member adapted to engage the top of a tire vaive pin, the top of the projection having a central depressionk therein adapted to lit the top of said valve pin.

In Witness whereof, I have hereunto signed my name.

Y GUSTAVE A. DUERLER, JR. 

